*{  
    margin: 0;  
    padding: 0;  
    text-decoration: none;  
    list-style: none;
}  
/* 导航栏 */
.nav{
    width: 100%;
    /* background-color:#8CC7E4; */
    height: 50px;
    z-index: 99999;
    background-color: #333;
    
}
.nav li{
    width: 100px;
    height: 50px;
    float: left;
    background-color: #333;
    padding: 0 30px;
    border-bottom: 1px solid rgb(219, 219, 219);
    /* border-bottom: 2px solid #000; */
}
.nav li:hover{
    background-color: rgba(255, 255, 255, 0.4);
}
.nav>li{
    position: relative;
}
.nav li a{
    width: 100px;
    height: 50px;
    line-height: 50px;
    display: block;
    text-align: center;
    color: #fff;
    font-size: 14px;
    /* background-color: pink; */
}
.nav2{
    position: absolute;
    width: 100px; 
    /* top: 52px; */
    left: 0;
    display: none; 
    z-index: 999999999;
}


.nav3{
    position: absolute;
    width: 100px; 
    top: 0px;
    left: 100px;
    display: none; 
    z-index: 999999999;
}